Joel Spolsky sings the praises of B&H, the mega photography and electronics store on 34th Street in Manhattan.
No, wait: The most amazing thing is that I have often gone into B&H to purchase a specific product, only to be talked into something cheaper. For example, once I went in to buy a field video monitor to use for some interviews I was conducting. I expected to pay $600 until the salesperson said, "Why don't you just get one of these cheap consumer portable DVD players? They have video inputs, they work just as well, and they're under $100." This was no accident. "The entire premise of our store is based upon your ability to come in, touch, feel, experiment, ask, and discuss your needs without sales pressure," B&H's website says.
Re: Circuit City, I'd wager that many of the businesses that have gone under so far have not done so because of the poor economy but because they were poor or unsustainable businesses. (via @anildash)